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Abstract:

A high yield green method was developed for the preparation of reactive nanotextured ceria (CeO2). The preparation method is based on the oxidation of a crystalline Ce(OH)CO3 precursor that decompose at relative low temperature (ca. 250 °C) yielding CeO2 nanocrystals initially rich in Ce3+. After increasing calcination temperatures (in the range 350-650 °C), PXRD analysis show a slight crystal growth after calcination temperatures up to 550 °C, however cell contraction in such case denotes the definitive oxidation of remnant Ce3+ centers. XPS results confirm Ce3+ fraction diminution as calcination temperature increases. TPR profiles of ceria samples show two reduction events being the low temperature one (at ca. 500 °C) related to a surface process in which approximately only one cerium monolayer is involved. Catalytic activity tests for COPROX reaction were performed under differential reactor conditions to evaluate their activity in the temperature range 100-300 °C. The optimum activity recorded for the sample calcined at 450 °C accounts for the compromise between oxide's activation and surface preservation. © 2011, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.

Registro:

Documento: Artículo
Título:Influence of the calcination temperature on the structure and reducibility of nanoceria obtained from crystalline Ce(OH)CO3 precursor
Autor:Poggio, E.; Jobbágy, M.; Moreno, M.; Laborde, M.; Mariño, F.; Baronetti, G.
Filiación:Laboratorio de Procesos Catalíticos, DIQ-FIUBA, Ciudad Universitaria, 1428 Buenos Aires, Argentina
INQUIMAE, Facultad de Ciencias Exactas y Naturales, Ciudad Universitaria, C1428EHA - Buenos Aires, Argentina
Palabras clave:Catalysts; COPROX; Hydrogen purification; Supports; Calcination temperature; Cell contraction; CO-PROX; Differential reactors; Green method; High yield; Hydrogen purification; Low temperatures; Nano-ceria; Nanotextured; Optimum activity; Preparation method; Surface process; Temperature range; Calcination temperature; CO-PROX; Co-prox reactions; Differential reactors; Hydrogen purification; Low temperatures; Preparation method; Temperature range; Catalyst activity; Catalyst supports; Catalysts; Cerium; Cerium compounds; Crystal growth; Crystalline materials; Hydrogen; Monolayers; Catalyst activity; Catalyst supports; Catalysts; Crystalline materials; Temperature; Calcination; Calcination
Año:2011
Volumen:36
Número:24
Página de inicio:15899
Página de fin:15905
DOI: http://dx.doi.org/10.1016/j.ijhydene.2011.09.026
Título revista:International Journal of Hydrogen Energy
Título revista abreviado:Int J Hydrogen Energy
ISSN:03603199
CODEN:IJHED
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_03603199_v36_n24_p15899_Poggio

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Citas:

---------- APA ----------
Poggio, E., Jobbágy, M., Moreno, M., Laborde, M., Mariño, F. & Baronetti, G. (2011) . Influence of the calcination temperature on the structure and reducibility of nanoceria obtained from crystalline Ce(OH)CO3 precursor. International Journal of Hydrogen Energy, 36(24), 15899-15905.
http://dx.doi.org/10.1016/j.ijhydene.2011.09.026
---------- CHICAGO ----------
Poggio, E., Jobbágy, M., Moreno, M., Laborde, M., Mariño, F., Baronetti, G. "Influence of the calcination temperature on the structure and reducibility of nanoceria obtained from crystalline Ce(OH)CO3 precursor" . International Journal of Hydrogen Energy 36, no. 24 (2011) : 15899-15905.
http://dx.doi.org/10.1016/j.ijhydene.2011.09.026
---------- MLA ----------
Poggio, E., Jobbágy, M., Moreno, M., Laborde, M., Mariño, F., Baronetti, G. "Influence of the calcination temperature on the structure and reducibility of nanoceria obtained from crystalline Ce(OH)CO3 precursor" . International Journal of Hydrogen Energy, vol. 36, no. 24, 2011, pp. 15899-15905.
http://dx.doi.org/10.1016/j.ijhydene.2011.09.026
---------- VANCOUVER ----------
Poggio, E., Jobbágy, M., Moreno, M., Laborde, M., Mariño, F., Baronetti, G. Influence of the calcination temperature on the structure and reducibility of nanoceria obtained from crystalline Ce(OH)CO3 precursor. Int J Hydrogen Energy. 2011;36(24):15899-15905.
http://dx.doi.org/10.1016/j.ijhydene.2011.09.026